Button.qml 范例文件

  
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  //Import the declarative plugins
  import QtQuick 2.0
  //Implementation of the Button control.
  Item {
      id: button
      width: 30
      height: 30
      property alias buttonText: innerText.text;
      property color color: "white"
      property color hoverColor: "#aaaaaa"
      property color pressColor: "slategray"
      property int fontSize: 10
      property int borderWidth: 1
      property int borderRadius: 2
      scale: state === "Pressed" ? 0.96 : 1.0
      onEnabledChanged: state = ""
      signal clicked
      //define a scale animation
      Behavior on scale {
          NumberAnimation {
              duration: 100
              easing.type: Easing.InOutQuad
          }
      }
      //Rectangle to draw the button
      Rectangle {
          id: rectangleButton
          anchors.fill: parent
          radius: borderRadius
          color: button.enabled ? button.color : "grey"
          border.width: borderWidth
          border.color: "black"
          Text {
              id: innerText
              font.pointSize: fontSize
              anchors.centerIn: parent
          }
      }
      //change the color of the button in differen button states
      states: [
          State {
              name: "Hovering"
              PropertyChanges {
                  target: rectangleButton
                  color: hoverColor
              }
          },
          State {
              name: "Pressed"
              PropertyChanges {
                  target: rectangleButton
                  color: pressColor
              }
          }
      ]
      //define transmission for the states
      transitions: [
          Transition {
              from: ""; to: "Hovering"
              ColorAnimation { duration: 200 }
          },
          Transition {
              from: "*"; to: "Pressed"
              ColorAnimation { duration: 10 }
          }
      ]
      //Mouse area to react on click events
      MouseArea {
          hoverEnabled: true
          anchors.fill: button
          onEntered: { button.state='Hovering'}
          onExited: { button.state=''}
          onClicked: { button.clicked();}
          onPressed: { button.state="Pressed" }
          onReleased: {
              if (containsMouse)
                button.state="Hovering";
              else
                button.state="";
          }
      }
  }